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Ingo Molnar06fcb0c2006-06-29 02:24:40 -07001#ifndef _LINUX_IRQ_H
2#define _LINUX_IRQ_H
Linus Torvalds1da177e2005-04-16 15:20:36 -07003
4/*
5 * Please do not include this file in generic code. There is currently
6 * no requirement for any architecture to implement anything held
7 * within this file.
8 *
9 * Thanks. --rmk
10 */
11
Adrian Bunk23f9b312005-12-21 02:27:50 +010012#include <linux/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013
Thomas Gleixner70dd4d92008-10-15 15:39:27 +020014#ifndef CONFIG_GENERIC_HARDIRQS
15# define nr_irqs NR_IRQS
16
17# define for_each_irq_desc(irq, desc) \
18 for (irq = 0; irq < nr_irqs; irq++)
19#else
20extern int nr_irqs;
21
22# define for_each_irq_desc(irq, desc) \
23 for (irq = 0, desc = irq_desc; irq < nr_irqs; irq++, desc++)
Thomas Gleixner811410f2008-10-16 14:16:11 +020024
25# define for_each_irq_desc_reverse(irq, desc) \
26 for (irq = nr_irqs -1, desc = irq_desc + (nr_irqs -1 ); \
27 irq > 0; irq--, desc--)
Thomas Gleixner70dd4d92008-10-15 15:39:27 +020028#endif
29
Thomas Gleixner2be3b522008-10-16 14:50:27 +020030#define for_each_irq_nr(irq) \
31 for (irq = 0; irq < nr_irqs; irq++)
32
Ingo Molnar06fcb0c2006-06-29 02:24:40 -070033#ifndef CONFIG_S390
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
35#include <linux/linkage.h>
36#include <linux/cache.h>
37#include <linux/spinlock.h>
38#include <linux/cpumask.h>
Jan Beulich908dcec2006-06-23 02:06:00 -070039#include <linux/irqreturn.h>
David Howells77904fd2007-02-28 20:13:26 -080040#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42#include <asm/irq.h>
43#include <asm/ptrace.h>
David Howells7d12e782006-10-05 14:55:46 +010044#include <asm/irq_regs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
David Howells57a58a92006-10-05 13:06:34 +010046struct irq_desc;
Harvey Harrisonec701582008-02-08 04:19:55 -080047typedef void (*irq_flow_handler_t)(unsigned int irq,
David Howells7d12e782006-10-05 14:55:46 +010048 struct irq_desc *desc);
David Howells57a58a92006-10-05 13:06:34 +010049
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051/*
52 * IRQ line status.
Thomas Gleixner6e213612006-07-01 19:29:03 -070053 *
Thomas Gleixner950f4422007-02-16 01:27:24 -080054 * Bits 0-7 are reserved for the IRQF_* bits in linux/interrupt.h
Thomas Gleixner6e213612006-07-01 19:29:03 -070055 *
56 * IRQ types
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 */
Thomas Gleixner6e213612006-07-01 19:29:03 -070058#define IRQ_TYPE_NONE 0x00000000 /* Default, unspecified type */
59#define IRQ_TYPE_EDGE_RISING 0x00000001 /* Edge rising type */
60#define IRQ_TYPE_EDGE_FALLING 0x00000002 /* Edge falling type */
61#define IRQ_TYPE_EDGE_BOTH (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)
62#define IRQ_TYPE_LEVEL_HIGH 0x00000004 /* Level high type */
63#define IRQ_TYPE_LEVEL_LOW 0x00000008 /* Level low type */
64#define IRQ_TYPE_SENSE_MASK 0x0000000f /* Mask of the above */
65#define IRQ_TYPE_PROBE 0x00000010 /* Probing in progress */
66
67/* Internal flags */
Thomas Gleixner950f4422007-02-16 01:27:24 -080068#define IRQ_INPROGRESS 0x00000100 /* IRQ handler active - do not enter! */
69#define IRQ_DISABLED 0x00000200 /* IRQ disabled - do not enter! */
70#define IRQ_PENDING 0x00000400 /* IRQ pending - replay on enable */
71#define IRQ_REPLAY 0x00000800 /* IRQ has been replayed but not acked yet */
72#define IRQ_AUTODETECT 0x00001000 /* IRQ is being autodetected */
73#define IRQ_WAITING 0x00002000 /* IRQ not yet seen - for autodetection */
74#define IRQ_LEVEL 0x00004000 /* IRQ level triggered */
75#define IRQ_MASKED 0x00008000 /* IRQ masked - shouldn't be seen again */
76#define IRQ_PER_CPU 0x00010000 /* IRQ is per CPU */
77#define IRQ_NOPROBE 0x00020000 /* IRQ is not valid for probing */
78#define IRQ_NOREQUEST 0x00040000 /* IRQ cannot be requested */
79#define IRQ_NOAUTOEN 0x00080000 /* IRQ will not be enabled on request irq */
Ingo Molnard7e25f32007-02-16 01:28:24 -080080#define IRQ_WAKEUP 0x00100000 /* IRQ triggers system wakeup */
81#define IRQ_MOVE_PENDING 0x00200000 /* need to re-target IRQ destination */
82#define IRQ_NO_BALANCING 0x00400000 /* IRQ is excluded from balancing */
Thomas Gleixner1adb0852008-04-28 17:01:56 +020083#define IRQ_SPURIOUS_DISABLED 0x00800000 /* IRQ was disabled by the spurious trap */
Suresh Siddha72b1e222008-07-10 11:16:45 -070084#define IRQ_MOVE_PCNTXT 0x01000000 /* IRQ migration from process context */
Thomas Gleixner950f4422007-02-16 01:27:24 -080085
Ingo Molnar0d7012a2006-06-29 02:24:43 -070086#ifdef CONFIG_IRQ_PER_CPU
Karsten Wiesef26fdd52005-09-06 15:17:25 -070087# define CHECK_IRQ_PER_CPU(var) ((var) & IRQ_PER_CPU)
Thomas Gleixner950f4422007-02-16 01:27:24 -080088# define IRQ_NO_BALANCING_MASK (IRQ_PER_CPU | IRQ_NO_BALANCING)
Karsten Wiesef26fdd52005-09-06 15:17:25 -070089#else
90# define CHECK_IRQ_PER_CPU(var) 0
Thomas Gleixner950f4422007-02-16 01:27:24 -080091# define IRQ_NO_BALANCING_MASK IRQ_NO_BALANCING
Karsten Wiesef26fdd52005-09-06 15:17:25 -070092#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -070094struct proc_dir_entry;
Eric W. Biederman5b912c12007-01-28 12:52:03 -070095struct msi_desc;
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -070096
Ingo Molnar8fee5c32006-06-29 02:24:45 -070097/**
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -070098 * struct irq_chip - hardware interrupt chip descriptor
Ingo Molnar8fee5c32006-06-29 02:24:45 -070099 *
100 * @name: name for /proc/interrupts
101 * @startup: start up the interrupt (defaults to ->enable if NULL)
102 * @shutdown: shut down the interrupt (defaults to ->disable if NULL)
103 * @enable: enable the interrupt (defaults to chip->unmask if NULL)
104 * @disable: disable the interrupt (defaults to chip->mask if NULL)
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700105 * @ack: start of a new interrupt
106 * @mask: mask an interrupt source
107 * @mask_ack: ack and mask an interrupt source
108 * @unmask: unmask an interrupt source
Ingo Molnar47c2a3a2006-06-29 02:25:03 -0700109 * @eoi: end of interrupt - chip level
110 * @end: end of interrupt - flow level
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700111 * @set_affinity: set the CPU affinity on SMP machines
112 * @retrigger: resend an IRQ to the CPU
113 * @set_type: set the flow type (IRQ_TYPE_LEVEL/etc.) of an IRQ
114 * @set_wake: enable/disable power-management wake-on of an IRQ
115 *
116 * @release: release function solely used by UML
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700117 * @typename: obsoleted by name, kept as migration helper
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 */
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700119struct irq_chip {
120 const char *name;
Ingo Molnar71d218b2006-06-29 02:24:41 -0700121 unsigned int (*startup)(unsigned int irq);
122 void (*shutdown)(unsigned int irq);
123 void (*enable)(unsigned int irq);
124 void (*disable)(unsigned int irq);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700125
Ingo Molnar71d218b2006-06-29 02:24:41 -0700126 void (*ack)(unsigned int irq);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700127 void (*mask)(unsigned int irq);
128 void (*mask_ack)(unsigned int irq);
129 void (*unmask)(unsigned int irq);
Ingo Molnar47c2a3a2006-06-29 02:25:03 -0700130 void (*eoi)(unsigned int irq);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700131
Ingo Molnar71d218b2006-06-29 02:24:41 -0700132 void (*end)(unsigned int irq);
133 void (*set_affinity)(unsigned int irq, cpumask_t dest);
Ingo Molnarc0ad90a2006-06-29 02:24:44 -0700134 int (*retrigger)(unsigned int irq);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700135 int (*set_type)(unsigned int irq, unsigned int flow_type);
136 int (*set_wake)(unsigned int irq, unsigned int on);
Ingo Molnarc0ad90a2006-06-29 02:24:44 -0700137
Paolo 'Blaisorblade' Giarrussob77d6ad2005-06-21 17:16:24 -0700138 /* Currently used only by UML, might disappear one day.*/
139#ifdef CONFIG_IRQ_RELEASE_METHOD
Ingo Molnar71d218b2006-06-29 02:24:41 -0700140 void (*release)(unsigned int irq, void *dev_id);
Paolo 'Blaisorblade' Giarrussob77d6ad2005-06-21 17:16:24 -0700141#endif
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700142 /*
143 * For compatibility, ->typename is copied into ->name.
144 * Will disappear.
145 */
146 const char *typename;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147};
148
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700149/**
150 * struct irq_desc - interrupt descriptor
151 *
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700152 * @handle_irq: highlevel irq-events handler [if NULL, __do_IRQ()]
153 * @chip: low level interrupt hardware access
Randy Dunlap472900b2007-02-16 01:28:25 -0800154 * @msi_desc: MSI descriptor
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700155 * @handler_data: per-IRQ data for the irq_chip methods
156 * @chip_data: platform-specific per-chip private data for the chip
157 * methods, to allow shared chip implementations
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700158 * @action: the irq action chain
159 * @status: status information
160 * @depth: disable-depth, for nested irq_disable() calls
David Brownell15a647e2006-07-30 03:03:08 -0700161 * @wake_depth: enable depth, for multiple set_irq_wake() callers
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700162 * @irq_count: stats field to detect stalled irqs
163 * @irqs_unhandled: stats field for spurious unhandled interrupts
Randy Dunlap5ac4d822007-07-31 00:39:03 -0700164 * @last_unhandled: aging timer for unhandled count
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700165 * @lock: locking for SMP
166 * @affinity: IRQ affinity on SMP
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700167 * @cpu: cpu index useful for balancing
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700168 * @pending_mask: pending rebalanced interrupts
Ingo Molnar8fee5c32006-06-29 02:24:45 -0700169 * @dir: /proc/irq/ procfs entry
170 * @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP
Ingo Molnara460e742006-10-17 00:10:03 -0700171 * @name: flow handler name for /proc/interrupts output
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 */
Ingo Molnar34ffdb72006-06-29 02:24:40 -0700173struct irq_desc {
Yinghai Lu08678b02008-08-19 20:50:05 -0700174 unsigned int irq;
David Howells57a58a92006-10-05 13:06:34 +0100175 irq_flow_handler_t handle_irq;
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700176 struct irq_chip *chip;
Eric W. Biederman5b912c12007-01-28 12:52:03 -0700177 struct msi_desc *msi_desc;
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700178 void *handler_data;
Ingo Molnar71d218b2006-06-29 02:24:41 -0700179 void *chip_data;
180 struct irqaction *action; /* IRQ action list */
181 unsigned int status; /* IRQ status */
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700182
Ingo Molnar71d218b2006-06-29 02:24:41 -0700183 unsigned int depth; /* nested irq disables */
David Brownell15a647e2006-07-30 03:03:08 -0700184 unsigned int wake_depth; /* nested wake enables */
Ingo Molnar71d218b2006-06-29 02:24:41 -0700185 unsigned int irq_count; /* For detecting broken IRQs */
186 unsigned int irqs_unhandled;
Alan Cox4f27c002007-07-15 23:40:55 -0700187 unsigned long last_unhandled; /* Aging timer for unhandled count */
Ingo Molnar71d218b2006-06-29 02:24:41 -0700188 spinlock_t lock;
Ingo Molnara53da522006-06-29 02:24:38 -0700189#ifdef CONFIG_SMP
Ingo Molnar71d218b2006-06-29 02:24:41 -0700190 cpumask_t affinity;
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700191 unsigned int cpu;
Ingo Molnara53da522006-06-29 02:24:38 -0700192#endif
Yinghai Lu8b8e8c12008-08-19 20:50:23 -0700193#ifdef CONFIG_GENERIC_PENDING_IRQ
Ingo Molnarcd916d32006-06-29 02:24:42 -0700194 cpumask_t pending_mask;
Ashok Raj54d5d422005-09-06 15:16:15 -0700195#endif
Ingo Molnar4a733ee2006-06-29 02:24:42 -0700196#ifdef CONFIG_PROC_FS
Ingo Molnara460e742006-10-17 00:10:03 -0700197 struct proc_dir_entry *dir;
Ingo Molnar4a733ee2006-06-29 02:24:42 -0700198#endif
Ingo Molnara460e742006-10-17 00:10:03 -0700199 const char *name;
Ravikiran G Thirumalaie729aa12007-05-08 00:29:13 -0700200} ____cacheline_internodealigned_in_smp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
Yinghai Lu9059d8f2008-08-19 20:50:10 -0700202
Ingo Molnar34ffdb72006-06-29 02:24:40 -0700203extern struct irq_desc irq_desc[NR_IRQS];
Yinghai Lu9059d8f2008-08-19 20:50:10 -0700204
Thomas Gleixnerc6b76742008-10-15 14:31:29 +0200205static inline struct irq_desc *irq_to_desc(unsigned int irq)
206{
207 return (irq < nr_irqs) ? irq_desc + irq : NULL;
208}
209
Ingo Molnar34ffdb72006-06-29 02:24:40 -0700210/*
211 * Migration helpers for obsolete names, they will go away:
212 */
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700213#define hw_interrupt_type irq_chip
214typedef struct irq_chip hw_irq_controller;
215#define no_irq_type no_irq_chip
Ingo Molnar34ffdb72006-06-29 02:24:40 -0700216typedef struct irq_desc irq_desc_t;
217
218/*
219 * Pick up the arch-dependent methods:
220 */
221#include <asm/hw_irq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700223extern int setup_irq(unsigned int irq, struct irqaction *new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
225#ifdef CONFIG_GENERIC_HARDIRQS
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700226
Ashok Raj54d5d422005-09-06 15:16:15 -0700227#ifdef CONFIG_SMP
Ashok Raj54d5d422005-09-06 15:16:15 -0700228
Yinghai Lu8b8e8c12008-08-19 20:50:23 -0700229#ifdef CONFIG_GENERIC_PENDING_IRQ
Ashok Raj54d5d422005-09-06 15:16:15 -0700230
Andrew Mortonc777ac52006-03-25 03:07:36 -0800231void set_pending_irq(unsigned int irq, cpumask_t mask);
232void move_native_irq(int irq);
Eric W. Biedermane7b946e2006-10-04 02:16:29 -0700233void move_masked_irq(int irq);
Ashok Raj54d5d422005-09-06 15:16:15 -0700234
Yinghai Lu8b8e8c12008-08-19 20:50:23 -0700235#else /* CONFIG_GENERIC_PENDING_IRQ */
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700236
237static inline void move_irq(int irq)
238{
239}
240
241static inline void move_native_irq(int irq)
242{
243}
244
Eric W. Biedermane7b946e2006-10-04 02:16:29 -0700245static inline void move_masked_irq(int irq)
246{
247}
248
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700249static inline void set_pending_irq(unsigned int irq, cpumask_t mask)
250{
251}
252
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700253#endif /* CONFIG_GENERIC_PENDING_IRQ */
Ashok Raj54d5d422005-09-06 15:16:15 -0700254
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700255#else /* CONFIG_SMP */
Ashok Raj54d5d422005-09-06 15:16:15 -0700256
Ashok Raj54d5d422005-09-06 15:16:15 -0700257#define move_native_irq(x)
Eric W. Biedermane7b946e2006-10-04 02:16:29 -0700258#define move_masked_irq(x)
Ashok Raj54d5d422005-09-06 15:16:15 -0700259
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700260#endif /* CONFIG_SMP */
Ashok Raj54d5d422005-09-06 15:16:15 -0700261
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262extern int no_irq_affinity;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263
Thomas Gleixner950f4422007-02-16 01:27:24 -0800264static inline int irq_balancing_disabled(unsigned int irq)
265{
Yinghai Lu08678b02008-08-19 20:50:05 -0700266 struct irq_desc *desc;
267
268 desc = irq_to_desc(irq);
269 return desc->status & IRQ_NO_BALANCING_MASK;
Thomas Gleixner950f4422007-02-16 01:27:24 -0800270}
271
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700272/* Handle irq action chains: */
David Howells7d12e782006-10-05 14:55:46 +0100273extern int handle_IRQ_event(unsigned int irq, struct irqaction *action);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700274
Ingo Molnar2e60bbb2006-06-29 02:24:39 -0700275/*
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700276 * Built-in IRQ handlers for various IRQ types,
277 * callable via desc->chip->handle_irq()
278 */
Harvey Harrisonec701582008-02-08 04:19:55 -0800279extern void handle_level_irq(unsigned int irq, struct irq_desc *desc);
280extern void handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc);
281extern void handle_edge_irq(unsigned int irq, struct irq_desc *desc);
282extern void handle_simple_irq(unsigned int irq, struct irq_desc *desc);
283extern void handle_percpu_irq(unsigned int irq, struct irq_desc *desc);
284extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700285
286/*
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700287 * Monolithic do_IRQ implementation.
Ingo Molnar2e60bbb2006-06-29 02:24:39 -0700288 */
David Howellsaf8c65b2006-09-25 23:32:07 -0700289#ifndef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
Harvey Harrisonec701582008-02-08 04:19:55 -0800290extern unsigned int __do_IRQ(unsigned int irq);
David Howellsaf8c65b2006-09-25 23:32:07 -0700291#endif
Ingo Molnar2e60bbb2006-06-29 02:24:39 -0700292
Ingo Molnardae86202006-06-29 02:24:52 -0700293/*
294 * Architectures call this to let the generic IRQ layer
295 * handle an interrupt. If the descriptor is attached to an
296 * irqchip-style controller then we call the ->handle_irq() handler,
297 * and it calls __do_IRQ() if it's attached to an irqtype-style controller.
298 */
Yinghai Lu46926b62008-08-19 20:50:15 -0700299static inline void generic_handle_irq_desc(unsigned int irq, struct irq_desc *desc)
Ingo Molnardae86202006-06-29 02:24:52 -0700300{
David Howellsaf8c65b2006-09-25 23:32:07 -0700301#ifdef CONFIG_GENERIC_HARDIRQS_NO__DO_IRQ
David Howells7d12e782006-10-05 14:55:46 +0100302 desc->handle_irq(irq, desc);
David Howellsaf8c65b2006-09-25 23:32:07 -0700303#else
Ingo Molnardae86202006-06-29 02:24:52 -0700304 if (likely(desc->handle_irq))
David Howells7d12e782006-10-05 14:55:46 +0100305 desc->handle_irq(irq, desc);
Ingo Molnardae86202006-06-29 02:24:52 -0700306 else
David Howells7d12e782006-10-05 14:55:46 +0100307 __do_IRQ(irq);
David Howellsaf8c65b2006-09-25 23:32:07 -0700308#endif
Ingo Molnardae86202006-06-29 02:24:52 -0700309}
310
Yinghai Lu46926b62008-08-19 20:50:15 -0700311static inline void generic_handle_irq(unsigned int irq)
312{
313 generic_handle_irq_desc(irq, irq_to_desc(irq));
314}
315
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700316/* Handling of unhandled and spurious interrupts: */
Ingo Molnar34ffdb72006-06-29 02:24:40 -0700317extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
David Howells7d12e782006-10-05 14:55:46 +0100318 int action_ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
Thomas Gleixnera4633adc2006-06-29 02:24:48 -0700320/* Resending of interrupts :*/
321void check_irq_resend(struct irq_desc *desc, unsigned int irq);
322
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700323/* Enable/disable irq debugging output: */
324extern int noirqdebug_setup(char *str);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700326/* Checks whether the interrupt can be requested by request_irq(): */
327extern int can_request_irq(unsigned int irq, unsigned long irqflags);
328
Thomas Gleixnerf8b54732006-07-01 22:30:08 +0100329/* Dummy irq-chip implementations: */
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700330extern struct irq_chip no_irq_chip;
Thomas Gleixnerf8b54732006-07-01 22:30:08 +0100331extern struct irq_chip dummy_irq_chip;
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700332
333extern void
Ingo Molnar145fc652006-10-19 23:28:28 -0700334set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip,
335 irq_flow_handler_t handle);
336extern void
Ingo Molnara460e742006-10-17 00:10:03 -0700337set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip,
338 irq_flow_handler_t handle, const char *name);
339
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700340extern void
Ingo Molnara460e742006-10-17 00:10:03 -0700341__set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
342 const char *name);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700343
Kevin Hilmanb019e572007-12-18 18:05:58 +0100344/* caller has locked the irq_desc and both params are valid */
345static inline void __set_irq_handler_unlocked(int irq,
346 irq_flow_handler_t handler)
347{
Yinghai Lu08678b02008-08-19 20:50:05 -0700348 struct irq_desc *desc;
349
350 desc = irq_to_desc(irq);
351 desc->handle_irq = handler;
Kevin Hilmanb019e572007-12-18 18:05:58 +0100352}
353
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700354/*
355 * Set a highlevel flow handler for a given IRQ:
356 */
357static inline void
David Howells57a58a92006-10-05 13:06:34 +0100358set_irq_handler(unsigned int irq, irq_flow_handler_t handle)
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700359{
Ingo Molnara460e742006-10-17 00:10:03 -0700360 __set_irq_handler(irq, handle, 0, NULL);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700361}
362
363/*
364 * Set a highlevel chained flow handler for a given IRQ.
365 * (a chained handler is automatically enabled and set to
366 * IRQ_NOREQUEST and IRQ_NOPROBE)
367 */
368static inline void
369set_irq_chained_handler(unsigned int irq,
David Howells57a58a92006-10-05 13:06:34 +0100370 irq_flow_handler_t handle)
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700371{
Ingo Molnara460e742006-10-17 00:10:03 -0700372 __set_irq_handler(irq, handle, 1, NULL);
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700373}
374
Ralf Baechle46f4f8f2008-02-08 04:22:01 -0800375extern void set_irq_noprobe(unsigned int irq);
376extern void set_irq_probe(unsigned int irq);
377
Eric W. Biederman3a16d712006-10-04 02:16:37 -0700378/* Handle dynamic irq creation and destruction */
Yinghai Lu6d50bc22008-08-19 20:50:22 -0700379extern unsigned int create_irq_nr(unsigned int irq_want);
Eric W. Biederman3a16d712006-10-04 02:16:37 -0700380extern int create_irq(void);
381extern void destroy_irq(unsigned int irq);
Thomas Gleixnerdd87eb32006-06-29 02:24:53 -0700382
Eric W. Biederman1f800252006-10-04 02:16:56 -0700383/* Test to see if a driver has successfully requested an irq */
384static inline int irq_has_action(unsigned int irq)
385{
Yinghai Lu08678b02008-08-19 20:50:05 -0700386 struct irq_desc *desc = irq_to_desc(irq);
Eric W. Biederman1f800252006-10-04 02:16:56 -0700387 return desc->action != NULL;
388}
389
Eric W. Biederman3a16d712006-10-04 02:16:37 -0700390/* Dynamic irq helper functions */
391extern void dynamic_irq_init(unsigned int irq);
392extern void dynamic_irq_cleanup(unsigned int irq);
393
394/* Set/get chip/data for an IRQ: */
Thomas Gleixnerdd87eb32006-06-29 02:24:53 -0700395extern int set_irq_chip(unsigned int irq, struct irq_chip *chip);
396extern int set_irq_data(unsigned int irq, void *data);
397extern int set_irq_chip_data(unsigned int irq, void *data);
398extern int set_irq_type(unsigned int irq, unsigned int type);
Eric W. Biederman5b912c12007-01-28 12:52:03 -0700399extern int set_irq_msi(unsigned int irq, struct msi_desc *entry);
Thomas Gleixnerdd87eb32006-06-29 02:24:53 -0700400
Yinghai Lu08678b02008-08-19 20:50:05 -0700401#define get_irq_chip(irq) (irq_to_desc(irq)->chip)
402#define get_irq_chip_data(irq) (irq_to_desc(irq)->chip_data)
403#define get_irq_data(irq) (irq_to_desc(irq)->handler_data)
404#define get_irq_msi(irq) (irq_to_desc(irq)->msi_desc)
Thomas Gleixnerdd87eb32006-06-29 02:24:53 -0700405
Thomas Gleixner6a6de9e2006-06-29 02:24:51 -0700406#endif /* CONFIG_GENERIC_HARDIRQS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700408#endif /* !CONFIG_S390 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
Ingo Molnar06fcb0c2006-06-29 02:24:40 -0700410#endif /* _LINUX_IRQ_H */